.box{
    width: 800px;
}
.layui-btn{
    float: right;
    margin-right: 20px;
}
.tableDemo{
    width: 800px;
    height: 400px;
}
.list-left{
    margin: 20px 0 0 20px;
    font-size: 20px;
    color: black;
}